CN113804553B - Visual experimental device and method for fault activation under three-dimensional stress state - Google Patents
Visual experimental device and method for fault activation under three-dimensional stress state Download PDFInfo
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- 230000004913 activation Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000007 visual effect Effects 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 267
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000011049 filling Methods 0.000 claims abstract description 44
- 239000004575 stone Substances 0.000 claims abstract description 23
- 238000002474 experimental method Methods 0.000 claims abstract description 21
- 238000012800 visualization Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000001994 activation Methods 0.000 abstract description 31
- 238000004088 simulation Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000011068 loading method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- 239000002243 precursor Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The invention provides a fault activation visualization experiment device and method under a three-dimensional stress state, belonging to the technical field of fault activation simulation of a coal mine bottom plate; the shell is an olive-shaped hollow cylinder; the water bag is arranged in the olive-shaped inner cavity of the shell, the olive-shaped inner cavity of the water bag is a filling cavity made of a fault similar material, and the water bag is provided with a water bag drain pipe and a water bag water injection pipe; the upper cover plate and the lower cover plate are respectively arranged at the upper end and the lower end of the shell and are vertical to the shell; the upper water permeable plate is positioned at the lower part of the upper cover plate and is contacted with the inner wall of the water sac; the upper cover plate is provided with a filling cavity drain pipe and a water permeable plate lifting mechanism; the lower cover plate is provided with an olive-shaped through hole, the lower water permeable plate is arranged in the olive-shaped through hole, and the side surface of the upper part of the lower water permeable plate is contacted with the inner wall of the water sac; the permeable stone is paved above the lower permeable plate; the water storage cavity is communicated with the olive-shaped through hole, and a filling cavity water filling port is arranged on the water storage cavity. The three-dimensional stress state of the invention is adjustable, and the difference between the fault tip and the activation process of other parts can be displayed.
Description
Technical Field
The invention belongs to the technical field of fault activation simulation of a coal mine bottom plate, and particularly discloses a fault activation visualization experiment device and method under a three-dimensional stress state.
Background
The fault activation water inrush process under the condition of the confined water of the coal seam floor is reproduced through indoor physical simulation, so that a valuable reference can be provided for the fault activation water inrush mechanism research. The existing experimental device provides an important basis for the study of the latter, but has the defects of different degrees.
The test system device for simulating fault water burst of the deep buried tunnel under the complex condition of the authorization bulletin No. CN 205808669U, the test device and the test method for simulating multi-field precursor information evolution of mining fault water burst on the deep confined water of the patent bulletin No. CN 111398564A, and the test device and the method for simulating deep fault formation, fault activation and fault water burst physical of the patent bulletin No. CN 109470839A are equivalent to the activation result in a two-dimensional stress state because the fault activation process must be analyzed by observing the contact position of the fault similar material and the boundary of the transparent model box. The patent publication No. CN 211318136U discloses a water inrush simulation device suitable for fault water inrush research on a confined aquifer, a fault activation water inrush evolution test system and test method under the multi-field coupling effect of the patent publication No. CN 111238990A, and a fault activation water inrush experimental device and method under a two-dimensional stress state for filling medium permeation instability water inrush in a fracture-type geological structure of CN 107290501A.
The engineering actual interruption layer is in a three-dimensional stress state, and the experimental device has deviation from an experimental result in the three-dimensional state; since the similar material of the fault is arranged as a flat plate structure, the difference between the fault tip and the activation process of other parts cannot be observed and analyzed; the fault similar material loading mode has a large influence on the fault activation process, the conventional triaxial servo experimental device such as MTS series and other large-scale equipment is high in use cost, equipment assembly and experimental flow are relatively complex, and visualization cannot be realized.
Therefore, a visual experimental device which is controllable in three-dimensional stress condition, convenient to operate and low in cost and can observe the difference between the fault tip and the activation process of other parts is needed.
Disclosure of Invention
The invention aims to provide a fault activation visualization experiment device and method under a three-dimensional stress state, wherein the three-dimensional stress state is adjustable, and the difference between a fault tip and other parts in the activation process can be displayed.
In order to achieve the aim, the invention provides a fault activation visualization experiment device under a three-dimensional stress state, which comprises a shell, an upper cover plate, a water sac, a lower cover plate, an upper water permeable plate, a lower water permeable plate, a water permeable stone and a water storage cavity; the shell is an olive-shaped hollow cylinder; the water bag is arranged in the olive-shaped inner cavity of the shell, the water bag is filled with water and expands to form an olive-shaped hollow cylinder, the olive-shaped inner cavity of the water bag is a filling cavity made of a similar material of faults, and the water bag is provided with a water bag drain pipe and a water bag water injection pipe; the upper cover plate and the lower cover plate are respectively arranged at the upper end and the lower end of the shell and are vertical to the shell; the upper water permeable plate is positioned at the lower part of the upper cover plate, is contacted with the inner wall of the water sac and is used for applying axial compression to the similar materials of faults; the upper cover plate is provided with a filling cavity drain pipe and a water permeable plate lifting mechanism for axially moving the upper water permeable plate; the lower cover plate is provided with an olive-shaped through hole, the lower water permeable plate is arranged in the olive-shaped through hole, and the side surface of the upper part of the lower water permeable plate is contacted with the inner wall of the water sac; the permeable stone is paved above the lower permeable plate; the water storage cavity is communicated with the olive-shaped through hole, and a filling cavity water filling port is arranged on the water storage cavity; the shell, the upper cover plate, the water bag and the lower cover plate are made of transparent materials.
Further, a threaded hole is formed in the upper cover plate, and the water permeable plate lifting mechanism comprises a water permeable plate lifting knob, a connecting rod and a threaded shaft; the connecting rod penetrates through the threaded hole, the upper end of the connecting rod is fixedly connected with the water permeable plate lifting knob, the middle part of the connecting rod is fixedly connected with the threaded shaft, and the lower end of the connecting rod is in rotary contact with the groove of the upper water permeable plate; the threaded shaft is in rotary fit with the threaded hole.
Further, the connecting rod is sleeved with a rubber plug, and the rubber plug is positioned above the threaded shaft and is tightly attached to the smooth section of the threaded hole.
Further, a gasket is arranged between the rubber plug and the threaded section of the threaded hole.
Further, the inlet of the filling cavity drain pipe is provided with a filter screen.
Further, the upper cover plate and the lower cover plate are respectively arranged at the upper end and the lower end of the shell through screws, and rubber pads are arranged between the upper cover plate and the shell and between the lower cover plate and the shell.
The invention also provides a fault activation visualization experiment method under the three-dimensional stress state, which is performed by using the fault activation visualization experiment device under the three-dimensional stress state, and comprises the following steps:
s1, preparing a test piece: the method comprises the steps of brushing a release agent on the inner wall of a water sac, filling water slowly through a water sac water filling pipe, closing the water sac water filling pipe and the water sac water draining pipe when water is discharged, installing a permeable stone and a lower permeable plate at the lower end of the shell, installing a lower cover plate on the shell through screws and rubber pads, layering and paving a fault-like material into a hollow part in the water sac in a layered manner, compacting, wherein the compacting height is lower than the water sac height, curing for a preset time, opening the water sac water draining pipe after curing is finished, reducing the water sac water pressure, taking out a fault-like material test piece, and sleeving the upper permeable plate, the fault-like material test piece, the permeable stone and the lower permeable plate into transparent rubber films with openings at the upper end and the lower end in sequence, namely fixing the upper permeable plate, the fault-like material test piece, the permeable stone and the lower permeable plate into a whole to ensure experimental tightness;
s2, instrument assembly: the method comprises the steps that an integral body formed by an upper water permeable plate, a fault similar material test piece, a water permeable stone and a lower water permeable plate which are sleeved into transparent rubber films with openings at the upper end and the lower end is placed into a filling cavity, an upper cover plate is mounted on a shell through screws and rubber pads, a rubber plug and a gasket in the upper cover plate play a role in preventing water leakage, and water is injected into a water bag water injection pipe to reach a designed water pressure value;
s3, pre-testing, namely injecting water with preset pressure into the filling cavity through a filling cavity water inlet, enabling the water to enter a fault similar material through the water storage cavity, the lower water permeable plate and the water permeable stone, then discharging the water through the upper water permeable plate, the filter screen and a filling cavity water discharge pipe, checking whether water is leaked at each connecting part, and if water is not leaked, starting a formal experiment;
s4, formal experiment: the confining pressure value born by the similar material of the fault can be adjusted through water injection of the water sac water injection pipe or water sac water drainage pipe, the extrusion degree of the upper water permeable plate to the similar material of the fault can be adjusted through rotating the water permeable plate lifting knob, so that the shaft pressure value born by the similar material of the fault is adjusted, the condition that the pressure-bearing water seeps in the fault under the three-dimensional stress condition can be simulated by utilizing the change of the confining pressure and the shaft pressure value, and the activation characteristic difference of the tip end of the fault and other parts is compared.
The invention has the following advantages:
according to the invention, the confining pressure value born by the fault similar material can be adjusted by injecting water into the water bag or discharging water in the water bag, and the axial pressure value born by the fault similar material can be adjusted by adjusting the extrusion degree of the upper water permeable plate on the fault similar material, so that the three-dimensional stress condition is controllable. The actual occurrence of faults in space is more similar to that of an olive-type filling cavity, and the difference of the activation process of the fault tip (namely the part of the similar fault material positioned at the narrow end of the filling cavity) and other parts can be displayed.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a fault activation visualization experiment device in a three-dimensional stress state;
FIG. 2 is a schematic plan view of an upper cover plate of the fault activation visualization experiment device in a three-dimensional stress state;
FIG. 3 is a cross-sectional view taken along the direction A-A' in FIG. 2;
fig. 4 is a schematic plan view of a lower cover plate of the fault activation visualization experiment device under the three-dimensional stress state.
In the figure: 1-a screw; 2-an upper cover plate; 3-a water permeable plate lifting knob; 4-filling cavity drain pipe; 5-connecting rods; 6-a rubber plug; 7-a gasket; 8-threading; 9-a threaded shaft; 10-filtering net; 11-upper water permeable plate; 12-water sac; 13-a housing; 14-permeable stone; 15-a water storage cavity; 16-filling a cavity water filling port; 17-a rubber pad; 18-a lower cover plate; 19-a water bag drain pipe; 20-water injection pipe of water bag; 21-lower water permeable plate.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a fault activation visualization experiment device under a three-dimensional stress state, which comprises a shell 13, an upper cover plate 2, a water sac 12, a lower cover plate 18, an upper water permeable plate 11, a lower water permeable plate 21, a water permeable stone 14 and a water storage cavity 15; the shell 13 is an olive-shaped hollow cylinder; the water bag 12 is arranged in the olive-shaped inner cavity of the shell 13, the water bag 12 is filled with water and expands into an olive-shaped hollow cylinder, the olive-shaped inner cavity of the water bag 12 is a filling cavity made of a fault similar material, and the water bag 12 is provided with a water bag drain pipe 19 and a water bag water injection pipe 20; the upper cover plate 2 and the lower cover plate 18 are respectively installed at the upper end and the lower end of the housing 13 and perpendicular to the housing 13; the upper water permeable plate 11 is positioned at the lower part of the upper cover plate 2, is contacted with the inner wall of the water sac 12 and is used for applying axial compression to the similar materials of faults; the upper cover plate 2 is provided with a filling cavity drain pipe 4 and a water permeable plate lifting mechanism for axially moving the upper water permeable plate 11; the lower cover plate 18 is provided with an olive-shaped through hole, the lower water permeable plate 21 is arranged in the olive-shaped through hole, and the upper side surface of the lower water permeable plate 21 is contacted with the inner wall of the water sac 12; the permeable stone 14 is paved above the lower permeable plate 21; the water storage cavity 15 is communicated with the olive-shaped through hole, and a filling cavity water filling port 16 is arranged on the water storage cavity 15; the shell 13, the upper cover plate 2, the water bag 12 and the lower cover plate 18 are made of transparent materials, so that three-dimensional visualization in the fault activation process is facilitated.
Further, a threaded hole is formed in the upper cover plate 2, and the water permeable plate lifting mechanism comprises a water permeable plate lifting knob 3, a connecting rod 5 and a threaded shaft 9; the connecting rod 5 passes through the threaded hole, the upper end is fixedly connected with the water permeable plate lifting knob 3, the middle part is fixedly connected with the threaded shaft 9, and the lower end is in rotary contact with the groove of the upper water permeable plate 11; the threaded shaft 9 is in rotational engagement with the threaded bore. When the water permeable plate lifting knob 3 is rotated, the threaded shaft 9 can move up and down in the threaded hole, so as to adjust the contact extrusion degree of the upper water permeable plate 11 and the similar fault material, simulate the change of the shaft pressure value born by the similar fault material,
further, a rubber plug 6 is sleeved on the connecting rod 5, and the rubber plug 6 is positioned above the threaded shaft 9 and is tightly attached to the smooth section of the threaded hole.
Further, a gasket 7 is provided between the rubber stopper 6 and the threaded section of the threaded hole. The rubber stopper 6 and the gasket 7 play a role in preventing water leakage.
Further, the inlets of the filling cavity drain pipe 4 and the upper water permeable plate 11 are provided with a filter screen 10.
Further, the upper cover plate 2 and the lower cover plate 18 are respectively mounted at the upper end and the lower end of the housing 13 by screws 1, and rubber pads 17 are respectively arranged between the upper cover plate 2 and the housing 13 and between the lower cover plate 18 and the housing 13.
The embodiment also provides a fault activation visualization experiment method under the three-dimensional stress state, which is performed by using the fault activation visualization experiment device under the three-dimensional stress state, and comprises the following steps.
(1) And (5) preparing a test piece. The inner wall of one side of the filling cavity of the water bag 12 is coated with a release agent and then is filled into the shell 13, water is slowly injected through the water bag water injection pipe 20, and when the water bag water discharge pipe 19 discharges water, the water injection can be stopped, and the water bag water injection pipe 20 and the water bag water discharge pipe 19 are closed. A water permeable stone 14 and a lower water permeable plate 21 are arranged at the lower end of the shell 13, and a lower cover plate 18 is arranged on the shell 13 through screws 1 and a rubber pad 17. And layering and compacting the fault similar materials into the hollow part in the water sac 12, wherein the compacted height is 0.5cm lower than the height of the water sac 12, and curing for 10 hours. And after curing, taking out the fault similar material test piece, and sleeving the upper water permeable plate 11, the fault similar material test piece, the water permeable stone 14 and the lower water permeable plate 21 into transparent rubber films with openings at the upper end and the lower end in sequence, namely fixing the upper water permeable plate 11, the fault similar material test piece, the water permeable stone 14 and the lower water permeable plate 21 into a whole to ensure experimental tightness.
(2) And (5) assembling the instrument. The water bag drain pipe 19 is opened to reduce the water pressure of the water bag, and the whole body composed of the upper water permeable plate 11, the fault similar material test piece, the water permeable stone 14 and the lower water permeable plate 21 sleeved in the transparent rubber film with the openings at the upper end and the lower end is placed in the filling cavity. The upper cover plate 2 is mounted to the housing 13 by screws 1 and rubber pads 17. The rubber plug 6 and the gasket 7 inside the upper cover plate 2 play a role in preventing water leakage. The water bladder water injection pipe 20 is injected with water to the designed water pressure value.
(3) Pre-test. Water with certain pressure is injected into the filling cavity through the filling cavity water inlet 16, so that the water enters the fault similar material through the water storage cavity 15, the lower water permeable plate 21 and the water permeable stone 14, is discharged through the upper water permeable plate 11, the filter screen 10 and the filling cavity water discharge pipe 4, whether water leakage exists at each connecting part is checked, and if water leakage does not exist, a formal experiment can be started.
(4) And (5) formally performing experiments. The confining pressure value born by the fault similar material can be adjusted by injecting water through the water sac water injection pipe 20 or draining water through the water sac water draining pipe 19, and the compression degree of the upper water permeable plate 11 on the fault similar material can be adjusted by rotating the water permeable plate lifting knob 3, so that the shaft pressure value born by the fault similar material is adjusted. By utilizing the change of confining pressure and axial pressure values, the seepage condition of the pressure-bearing water in the fault under the three-dimensional stress condition can be simulated, and the activation characteristic difference of the fault tip and other parts can be compared.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. The visual experimental device for fault activation under the three-dimensional stress state is characterized by comprising a shell, an upper cover plate, a water sac, a lower cover plate, an upper water permeable plate, a lower water permeable plate, a water permeable stone and a water storage cavity;
the shell is an olive-shaped hollow cylinder;
the water bag is arranged in the olive-shaped inner cavity of the shell, the water bag is filled with water and expands to form an olive-shaped hollow cylinder, the olive-shaped inner cavity of the water bag is a filling cavity made of a fault similar material, and the water bag is provided with a water bag drain pipe and a water bag water injection pipe;
the upper cover plate and the lower cover plate are respectively arranged at the upper end and the lower end of the shell and are perpendicular to the shell;
the upper water permeable plate is positioned at the lower part of the upper cover plate, is contacted with the inner wall of the water sac and is used for applying axial compression to the similar materials of faults, and a filter screen is arranged at the bottom inlet;
the upper cover plate is provided with a filling cavity drain pipe and a water permeable plate lifting mechanism for axially moving the upper water permeable plate;
the lower cover plate is provided with an olive-shaped through hole, the lower water permeable plate is arranged in the olive-shaped through hole, and the upper side surface of the lower water permeable plate is contacted with the inner wall of the water sac;
the permeable stone is paved above the lower permeable plate;
the water storage cavity is communicated with the olive-shaped through hole, and a filling cavity water filling port is arranged on the water storage cavity;
the shell, the upper cover plate, the water bag and the lower cover plate are made of transparent materials;
the upper cover plate is provided with a threaded hole, and the water permeable plate lifting mechanism comprises a water permeable plate lifting knob, a connecting rod and a threaded shaft;
the connecting rod penetrates through the threaded hole, the upper end of the connecting rod is fixedly connected with the water permeable plate lifting knob, the middle part of the connecting rod is fixedly connected with the threaded shaft, and the lower end of the connecting rod is in rotary contact with the groove of the upper water permeable plate;
the threaded shaft is in running fit with the threaded hole;
when the water permeable plate lifting knob is rotated, the threaded shaft moves up and down in the threaded hole, so that the contact extrusion degree of the upper water permeable plate and the fault similar material is adjusted, and the shaft pressure value change born by the fault similar material is simulated.
2. The visual experimental device for fault activation under the three-dimensional stress state according to claim 1, wherein the connecting rod is sleeved with a rubber plug, and the rubber plug is positioned above the threaded shaft and is tightly attached to the smooth section of the threaded hole.
3. The device for visualizing a fault activation in a three-dimensional stress state as set forth in claim 2, wherein a spacer is disposed between the rubber plug and the threaded section of the threaded bore.
4. A three-dimensional stress state fault activation visualization experiment device according to claim 3, wherein the inlet of the filling cavity drain pipe is provided with a filter screen.
5. The visual experimental device for fault activation under a three-dimensional stress state according to claim 4, wherein the upper cover plate and the lower cover plate are respectively arranged at the upper end and the lower end of the shell through screws, and rubber pads are arranged between the upper cover plate and the shell and between the lower cover plate and the shell.
6. A method for performing a three-dimensional stress state fault activation visualization experiment, which is characterized by using the three-dimensional stress state fault activation visualization experiment device according to any one of claims 1-5, and comprising the following steps:
s1, preparing a test piece: the method comprises the steps of brushing a release agent on the inner wall of a water sac, filling water slowly through a water sac water filling pipe, closing the water sac water filling pipe and the water sac water draining pipe when water is discharged, installing a permeable stone and a lower permeable plate at the lower end of the shell, installing a lower cover plate on the shell through screws and rubber pads, layering and paving a fault-like material into a hollow part in the water sac in a layered manner, compacting, wherein the compacting height is lower than the water sac height, curing for a preset time, opening the water sac water draining pipe after curing is finished, reducing the water sac water pressure, taking out a fault-like material test piece, and sleeving the upper permeable plate, the fault-like material test piece, the permeable stone and the lower permeable plate into transparent rubber films with openings at the upper end and the lower end in sequence, namely fixing the upper permeable plate, the fault-like material test piece, the permeable stone and the lower permeable plate into a whole to ensure experimental tightness;
s2, instrument assembly: the method comprises the steps that an integral body formed by an upper water permeable plate, a fault similar material test piece, a water permeable stone and a lower water permeable plate which are sleeved into transparent rubber films with openings at the upper end and the lower end is placed into a filling cavity, an upper cover plate is mounted on a shell through screws and rubber pads, a rubber plug and a gasket in the upper cover plate play a role in preventing water leakage, and water is injected into a water bag water injection pipe to reach a designed water pressure value;
s3, pre-testing, namely injecting water with preset pressure into the filling cavity through a filling cavity water inlet, enabling the water to enter a fault similar material through the water storage cavity, the lower water permeable plate and the water permeable stone, then discharging the water through the upper water permeable plate, the filter screen and a filling cavity water discharge pipe, checking whether water is leaked at each connecting part, and if water is not leaked, starting a formal experiment;
s4, formal experiment: the confining pressure value born by the similar material of the fault can be adjusted through water injection of the water sac water injection pipe or water sac water drainage pipe, the extrusion degree of the upper water permeable plate to the similar material of the fault can be adjusted through rotating the water permeable plate lifting knob, so that the shaft pressure value born by the similar material of the fault is adjusted, the condition that the pressure-bearing water seeps in the fault under the three-dimensional stress condition can be simulated by utilizing the change of the confining pressure and the shaft pressure value, and the activation characteristic difference of the tip end of the fault and other parts is compared.
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| CN202111062022.7A CN113804553B (en) | 2021-09-10 | 2021-09-10 | Visual experimental device and method for fault activation under three-dimensional stress state |
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| CN202111062022.7A CN113804553B (en) | 2021-09-10 | 2021-09-10 | Visual experimental device and method for fault activation under three-dimensional stress state |
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| CN113804553B true CN113804553B (en) | 2024-02-13 |
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